docs: def get_appliance(self, id_or_uri, fields=''):
          """
          Gets the particular Image Streamer resource based on its ID or URI.
  
          Args:
              id_or_uri:
                  Can be either the Os Deployment Server ID or the URI
              fields:
                  Specifies which fields should be returned in the result.
  
          Returns:
               dict: Image Streamer resource.
          """
          uri = self.URI + '/image-streamer-appliances/' + extract_id_from_uri(id_or_uri)
          if fields:
              uri += '?fields=' + fields
  
          return self._client.get(uri)